https://bugzilla.samba.org/show_bug.cgi?id=8201
--- Comment #6 from Martin Wilck <martin.wi...@ts.fujitsu.com> 2011-06-14
15:40:48 UTC ---
(In reply to comment #5)
>> Under Linux, trying to
>> read
>
> No, reading is fine; there just will never be any user xattrs.
I repeat - trying to read a user attr of a symlink raises EPERM. This is on
Fedora 15, 2.6.38.6-27.fc15:
[root@cooper SRC]# ls -lZ
-rw-r--r--. root root system_u:object_r:lib_t:s0 file
lrwxrwxrwx. root root system_u:object_r:lib_t:s0 link -> file
[root@cooper SRC]# getfattr -h -n user.mime_type link
link: user.mime_type: Operation not permitted
[root@cooper SRC]# strace getfattr -h -n user.mime_type link
...
lstat("link", {st_mode=S_IFLNK|0777, st_size=4, ...}) = 0
lgetxattr("link", "user.mime_type", 0x0, 0) = -1 EPERM (Operation not
permitted)
...
> NO_SYMLINK_XATTRS causes symlink xattr reads and writes to return the empty
> set
> and ENOTSUP, respectively, without calling the OS. On Linux, this is just an
> optimization unless you care about the difference in the error code. It's
> conceivable that another OS might return an error on reads, in which case
> rsync
> would not want to pass that error along.
I can't follow you. Not even trying to call the OS isn't "just an
optimization", it is plain wrong for all except "user" attributes.
> The more significant effect of NO_SYMLINK_XATTRS is to tell the fake-super
> mode
> to store symlinks as regular files so it can attach the fake-super xattr. If
> rsync waited to get EPERM on the symlink, it would have to go back and replace
> the symlink with a regular file.
Actually, I don't care if rsync just traps EPERM or checks the attribute
namespace before trying to set it. That's mostly a matter of programming style.
How do we proceed now?
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